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DNF Shallow Ground Water Monitoring Wells
Proceedings of the 2019 Mississippi Water Resources Conference

Year: 2019 Authors: Johnson D.R.


In 2010 the USACE established 25 groundwater monitoring wells in Delta National Forest and Twin Oaks Wildlife Management Area. Each well extends approximately three feet into the ground. The intent was to determine the depth and duration of soil saturation in a bottomland hardwood forest. The hydrology component of wetlands can be satisfied by the saturation of the top foot of soil during a continuous 21 day period during the growing season. Well locations were sited based on historical stage and duration data. Wells were placed in locations that had a flood frequency from 1 year to 50 year intervals, and an annual continuous duration from one to 28 days. The observed periods of soil saturation differed significantly from the flood duration, and ranged from zero to 250 days per year. Most sites were saturated for more than 50 days per year. This study shows that these wetlands are classic BLH wetlands, where the major source of moisture comes from winter rains. The infrequent out of bank flooding augments the available moisture.

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